Often called ablation, this process is an effective means of vaporizing even highly refractory materials like solid carbon. The ablated material is then carried through the cooling jet by an inert gas such as helium or argon.

Recoil from the ablation implodes the inner layer, producing a shock wave that compresses the inner layers of the D-T fuel. The implosion speed is several hundred kilometres per second, produced by a force equivalent to some 10 billion atmospheres. The target layers are designed such that the…

…melt-out till, and sometimes as ablation till. In many cases, the material located between a moving glacier and its bedrock bed is severely sheared, compressed, and “over-compacted.” This type of deposit is called lodgment till. By definition, till is any material laid down directly or reworked by a glacier. Typically,…

dative, accusative, ablative, instrumental, and locative. However, many of these forms overlapped so that usually only three or four different forms existed; e.g., žam ‘time’ was both nominative and accusative, žamê was ablative, and žamu was genitive, dative, instrumental, and locative. A special form of locative was…

…can be measured by the alternate binaural loudness balance test. The subject is asked to set the controls so that the loudness of the tone heard in the defective ear matches that of the tone heard in the normal ear. By repeating the comparison at several intensity levels, the presence…

Ableism, type of discrimination in which able-bodied individuals are viewed as normal and superior to those with a disability, resulting in prejudice toward the latter. The modern concept of ableism emerged in the 1960s and ’70s, when disability activists placed disability in a political context.

Ableman v. Booth, (1859), case in which the U.S. Supreme Court upheld both the constitutionality of the Fugitive Slave Act and the supremacy of the federal government over state governments. Sherman Booth was an abolitionist newspaper editor in Wisconsin who had been sentenced to jail by a federal

Snake-eyed skink, any of about 35 species of lizards constituting two genera (Ablepharus and Cryptoblepharus) in the family Scincidae. Snake-eyed skinks lack eyelids and have transparent scales (spectacles) covering the eyes similar to those of snakes. Although the function of the spectacle remains

Snake-eyed skink, any of about 35 species of lizards constituting two genera (Ablepharus and Cryptoblepharus) in the family Scincidae. Snake-eyed skinks lack eyelids and have transparent scales (spectacles) covering the eyes similar to those of snakes. Although the function of the spectacle remains

…2001 saw the debut of Ableton Live, a computer software program that enabled users to compose, cue, and blend digital tracks by way of a waveform display—thus eliminating the motor skills previously necessary to perform an effective DJ set.

Gary Ablett, Australian rules football player who was celebrated for taking the sport’s “Mark of the Century” against Collingwood at the Melbourne Cricket Ground in 1994, in which he leaped over two opposing players and caught the ball with one hand while twisting his body several feet in the air.

Ablution,, in religion, a prescribed washing of part or all of the body or of possessions, such as clothing or ceremonial objects, with the intent of purification or dedication. Water, or water with salt or some other traditional ingredient, is most commonly used, but washing with blood is not

Antiballistic missile (ABM), Weapon designed to intercept and destroy ballistic missiles. Effective ABM systems have been sought since the Cold War, when the nuclear arms race raised the spectre of complete destruction by unstoppable ballistic missiles. In the late 1960s both the U.S. and the

Anti-Ballistic Missile Treaty (ABM Treaty), arms control treaty ratified in 1972 between the United States and the Soviet Union to limit deployment of missile systems that could theoretically be used to destroy incoming intercontinental ballistic missiles (ICBMs) launched by the other superpower.

ABN AMRO Holding NV, holding company of the Dutch bank ABN AMRO Bank NV. Headquarters are in Amsterdam. Its origins date to 1824 when King William I of the Netherlands issued a royal decree that established the Netherlands Trading Society (Nederlandsche Handel-Maatschappij; NHM) in order to

Abenaki, Algonquian-speaking North American Indian tribe that united with other tribes in the 17th century to furnish mutual protection against the Iroquois Confederacy. The name refers to their location “toward the dawn.” In its earliest known form, the Abenaki Confederacy consisted of tribes or

…proclaimed king of Israel by Abner, Saul’s cousin and commander in chief, who then became the real power behind the throne. The House of Judah, however, followed David, and war broke out between the two kingdoms. When Abner took Rizpah, one of Saul’s concubines, Ishbosheth objected, because Abner’s action was…

Its title character, Abner Yokum, was a handsome, muscle-bound hillbilly, as lazy as he was dull witted. Like Abner, most of the men of Dogpatch were cast as essentially useless to society; all the real work was done by the “wimmenfolk.” One such woman was the curvaceous and…

The writing team of Dan Abnett and Andy Lanning, who were largely responsible for the revival of Marvel’s “cosmic” comic properties, introduced a new team, set in the present day, in Guardians of the Galaxy vol. 2, no. 1 (May 2008). This new generation of Guardians included galactic police…

Sir William de Wiveleslie Abney, a specialist in the chemistry of photography, especially noted for his development of a photographic emulsion that he used to map the solar spectrum far into the infrared. Commissioned in the Royal Engineers (1861), he taught chemistry and photography at the School

Psychopathology, the study of mental disorders and unusual or maladaptive behaviours. An understanding of the genesis of mental disorders is critical to mental health professionals in psychiatry, psychology, and social work. One controversial issue in psychopathology is the distinction between

Disease, any harmful deviation from the normal structural or functional state of an organism, generally associated with certain signs and symptoms and differing in nature from physical injury. A diseased organism commonly exhibits signs or symptoms indicative of its abnormal state. Thus, the normal

Turku, city, southwestern Finland, at the mouth of the Aura River, west-northwest of Helsinki. Finland’s oldest city, it was originally a trading centre a few miles north of its present site, to which it was transferred at the beginning of the 13th century. It received its first known charter in

ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB

Artesia’s Abo Elementary School is the first underground school in the United States; it was designed to protect against atomic radiation and fallout. Inc. village, 1905; city, 1930. Pop. (2000) 10,692; (2010) 11,301.

He founded the University of Åbo (Turku) in 1640 and acted as its chancellor from 1646 until his death. While serving as lord high chancellor (1641–80), he also exerted great influence as a member of the regency council (1660–72) for Charles XI. Brahe’s brother Count Nils Brahe also…

Treaty of Åbo, (1743), peace settlement that concluded the Russo-Swedish War of 1741–43 by obliging Sweden to cede a strip of southern Finland to Russia and to become temporarily dependent on Russia. As a result of the Great Northern War (Treaty of Nystad, 1721), Sweden had lost Estonia, Livonia,

Lucia dos Santos, Portuguese shepherd girl, later a Carmelite nun, who claimed she saw visions of the Virgin Mary in 1917 at Fátima, Portugal, which subsequently became one of the most famous Marian shrines in the world. The first of six visions came to Lucia on May 13, 1917, while she was tending

…Akan of Ghana perform the Abofor dance, a dance-mime staged after the killing of a dangerous animal. This is meant to placate the spirit of the beast and inform the community of the manner in which it was killed. Tutsi hunters in Congo (Kinshasa) commemorate a successful hunt in their…

Nabuco’s book O Abolicionismo (1883; Abolitionism) argued that slavery was poisoning the very life of the nation. The movement succeeded: in 1884 the governments of Ceará and Amazonas freed slaves in those regions, and the following year the national government liberated all slaves over 60 years of age. Finally, the…

Abolitionism, (c. 1783–1888), in western Europe and the Americas, the movement chiefly responsible for creating the emotional climate necessary for ending the transatlantic slave trade and chattel slavery. With the decline of Roman slavery in the 5th century, the institution waned in western Europe

…powers were destroyed by the Abolition of Heritable Jurisdictions (Scotland) Act of 1747. Other statutes required oaths of allegiance to the Hanoverian dynasty from the Episcopalian clergy, banned the wearing of kilts and tartans in an attempt to erode distinctive Highlands practices, and confiscated arms. The administration also confiscated the…

The Abolition of Man, a book on education and moral values by C.S. Lewis, published in 1943. The book originated as the Riddell Memorial Lectures, three lectures delivered at the University of Durham in February 1943. Many people regard this as Lewis’s most important book. In it he argues that

Nabuco’s book O Abolicionismo (1883; Abolitionism) argued that slavery was poisoning the very life of the nation. The movement succeeded: in 1884 the governments of Ceará and Amazonas freed slaves in those regions, and the following year the national government liberated all slaves over 60 years of age. Finally, the…

Abolitionism, (c. 1783–1888), in western Europe and the Americas, the movement chiefly responsible for creating the emotional climate necessary for ending the transatlantic slave trade and chattel slavery. With the decline of Roman slavery in the 5th century, the institution waned in western Europe

…derived from the esophagus—and the abomasum (or reed), which corresponds to the stomach of other mammals. The omasum is almost absent in chevrotains. Camels have a three-chambered stomach, lacking the separation of omasum and abomasum; the rumen and reticulum are equipped with glandular pockets separated by muscular walls having sphincters…

Abomey, town, southern Benin. It is located about 60 miles (100 km) north of Cotonou. Probably founded in the early 17th century, it soon became the capital of the kingdom of Abomey (later Dahomey; the country’s previous name), which dominated production and trade with the European enterprises on

…found in the environs of Abomey, Kétou, Aplahoué (or Parahoué), and Zagnanado. The plateaus consist of clays on a crystalline base. The Abomey, Aplahoué, and Zagnanado plateaus are from 300 to 750 feet high, and the Kétou plateau is up to 500 feet in height.

The University of Abomey-Calavi (previously known as the University of Dahomey [1970–75] and the National University of Benin [1975–2001]), located in Cotonou, was founded in 1970. The university’s student body has been, along with workers, the main political force in the country since the early 1980s.…

…Miocene fossils was the “abominable coalman,” so called because the best-preserved remains, a complete skeleton, were found during the 1950s in a lignite mine in northern Italy. Oreopithecus possessed a number of dental and bony characters that are typically hominid. The canines were relatively short and stout; the face…

Abominable Snowman, mythical monster supposed to inhabit the Himalayas at about the level of the snow line. Though reports of actual sightings of such a creature are rare, certain mysterious markings in the snow have traditionally been attributed to it. Those not caused by lumps of snow or stones

The Abominable Snowman, British horror film, released in 1957, that was one of the first in a long series of movies produced by Hammer Films and starring Peter Cushing. English botanist John Rollason (played by Cushing) is conducting research in the Himalayas when he encounters an expedition led by

The Abominable Snowman, British horror film, released in 1957, that was one of the first in a long series of movies produced by Hammer Films and starring Peter Cushing. English botanist John Rollason (played by Cushing) is conducting research in the Himalayas when he encounters an expedition led by

The humorous Abomunist Manifesto (1959), by African American Beat poet Bob Kaufman, also had a markedly anarchist flavour. (According to Kaufman, “Abomunists vote against everyone by not voting for anyone.”) Both the Journal and Kaufman’s Manifesto were published by City Lights press, founded with the City Lights…

The Degema-Abonnema port (boats now anchor near the palm oil plant at Abonnema downstream) has been eclipsed by the success of Port Harcourt, 17 miles (27 km) east; but vessels of 16-foot (5-metre) draft still navigate the 42 miles (68 km) to the port from Bonny…

…largely mountainous; Mounts Leuser and Abong Abong rise to elevations of 11,092 feet (3,381 metres) and 9,793 feet (2,985 metres), respectively. Except in the extreme north, there is a fairly wide coastal plain, and the rivers are short and have little value for shipping. The southwestern coast is dotted with…

Abong Mbang, port located in southeastern Cameroon. It lies on the upper Nyong River, at the head of seasonal river navigation from Mbalmayo. Timber (especially mahogany), tobacco, and coffee are major products in the area; bricks are manufactured locally. The Dja Faunal Reserve—which was

Abong Mbang, port located in southeastern Cameroon. It lies on the upper Nyong River, at the head of seasonal river navigation from Mbalmayo. Timber (especially mahogany), tobacco, and coffee are major products in the area; bricks are manufactured locally. The Dja Faunal Reserve—which was

The Degema-Abonnema port (boats now anchor near the palm oil plant at Abonnema downstream) has been eclipsed by the success of Port Harcourt, 17 miles (27 km) east; but vessels of 16-foot (5-metre) draft still navigate the 42 miles (68 km) to the port from Bonny…

Abood v. Detroit Board of Education, legal case in which the U.S. Supreme Court on May 23, 1977, ruled unanimously (9–0) that agency-shop (or union-shop) clauses in the collective-bargaining agreements of public-sector unions cannot be used to compel nonunion employees to fund political or

The Adi, who constitute the largest tribal group in the state, live in the central region. The Mishmi inhabit the northeastern hills, and the Wancho, Nocte, and Tangsa are concentrated in the southeastern district of Tirap. Throughout the state, the tribal peoples generally share similar rural…

American Indian, member of any of the aboriginal peoples of the Western Hemisphere. Eskimos (Inuit and Yupik/Yupiit) and Aleuts are often excluded from this category, because their closest genetic and cultural relations were and are with other Arctic peoples rather than with the groups to their

…from 1966, and the federal Aboriginal Land Rights Act (1976), applying to the Northern Territory, was particularly important. In 1967 the general electorate overwhelmingly supported a constitutional amendment to increase Commonwealth powers in Aboriginal matters. Equality in formal civic rights, wage payments, and social welfare benefits became the norm. Some…

Australian Aboriginal peoples, one of the two distinct Indigenous peoples of Australia, the other being the Torres Strait Islander peoples. It has long been conventionally held that Australia is the only continent where the entire Indigenous population maintained a single kind of adaptation—hunting

Australian Aboriginal peoples, one of the two distinct Indigenous peoples of Australia, the other being the Torres Strait Islander peoples. It has long been conventionally held that Australia is the only continent where the entire Indigenous population maintained a single kind of adaptation—hunting

In 1886 the Aborigines Protection Act defined categories of Aboriginal Australians and forced those of mixed ancestry off the reserves. By 1917 all full-blooded Aboriginal peoples were concentrated on the two surviving mission stations largely against their will, and children were separated from their parents and placed in…

…Aborigines’ Rights Protection Society (ARPS) to prevent the wholesale expropriation of African lands by European entrepreneurs or officials. The ARPS went on to campaign against the exclusion of qualified Africans from the colonial administration. Following this, in 1918–20, a National Congress of British West Africa was formed by professionals…

Abortifacient, any drug or chemical preparation that induces abortion. For centuries, herbal abortifacients have been made from infusions or oils of plants such as pennyroyal (Mentha pulegium), angelica (Angelica species), and tansy (Tanacetum vulgare). Such preparations are no more likely to

Abortion, the expulsion of a fetus from the uterus before it has reached the stage of viability (in human beings, usually about the 20th week of gestation). An abortion may occur spontaneously, in which case it is also called a miscarriage, or it may be brought on purposefully, in which case it is

RU-486, first trade name for mifepristone, a synthetic steroid drug prescribed for inducing abortion during the early weeks of pregnancy. The name is derived from an abbreviation for the pharmaceutical company Roussel-Uclaf plus a serial number. RU-486 was approved for use in France in 1988, and

Vibriosis, a venereal disease that causes abortion; pneumonia, an inflammation of the lungs; and shipping fever all cause serious losses and are difficult to control except through good management. Broad-spectrum antibiotics (antibiotics that are effective against various microorganisms), as well as powerful and specific pharmaceuticals,…

Miscarriage, spontaneous expulsion of the embryo or fetus from the uterus before the 20th week of pregnancy, prior to the conceptus having developed sufficiently to live without maternal support. An estimated 10 to 25 percent of recognized pregnancies are lost as a result of miscarriage, with the

… (of the Guera Massif) and Abou Telfân are composed of refugee populations who, living on their mountainous terrain, have resisted various invasions. On the plains surrounding the Hadjeray are the Bulala, Kuka, and the Midogo, who are sedentary peoples. In the eastern region of Ouaddaï live the Maba, among whom…

Abū Qīr Bay, semicircular inlet of the Mediterranean Sea, lying between Abū Qīr Point (southwest) and the mouth of the Rosetta Branch (northeast) of the Nile River delta, in Lower Egypt. The bay was the scene of the Battle of the Nile (1798), in which an English fleet under Rear Admiral Sir Horatio

Battle of the Nile, battle that was one of the greatest victories of the British admiral Horatio Nelson. It was fought on August 1, 1798, between the British and French fleets in Abū Qīr Bay, near Alexandria, Egypt. The French Revolutionary general Napoleon Bonaparte in 1798 made plans for an

Hornby’s second novel, About a Boy (1998), concerns another feckless 30-something and his unlikely friendship with a 12-year-old misfit. It was made into a movie in 2002 and a television series in 2014. His other novels include How to Be Good (2001), A Long Way Down (2005; film…

…school and wrote a treatise, About Analogy, which laid down rules for declension, etc. In editing the work of lyric and dramatic poets he introduced innovations in metrical analysis and textual criticism that were widely adopted by later scholars. Aristophanes also was responsible for arranging Plato’s dialogues in trilogies, and…

Booth returned for the tearjerker About Mrs. Leslie (1954), playing the lover of a tycoon (Robert Ryan). In 1955 Mann helmed The Rose Tattoo, with a screenplay by Williams. It featured Italian actress Anna Magnani, in her Hollywood debut, as a grieving widow; Lancaster was the truck driver who revives…

…of a transgender teenager in About Ray and was praised for the sincerity of her performance as a cheerfully smothering mother in The Meddler (both 2015). Sarandon appeared as another troublemaking parent in A Bad Moms Christmas (2017).

…acted in such films as About Schmidt (2002), for which she received another Academy Award nomination; Failure to Launch (2006); and The Day the Earth Stood Still (2008), a remake of the 1951 classic. In 2008 Bates took a supporting role in Revolutionary Road, portraying a real estate agent in…

…the Wonder (2012); and in About Time (2013), an introspective romantic dramedy that delved into the effects of time travel. In 2014 McAdams played a human rights lawyer in the espionage thriller A Most Wanted Man. The next year she joined the cast of the second season of True Detective,…

The hero of Above Ground (1968), after spending most of his youth in hospital rooms, finds rejuvenation in sexual encounters with a series of willing women. Both novels received mixed critical reviews; Ludwig’s characters were two-dimensional and unsympathetic. He was more successful in his third novel, A Woman…

…MacInnes began her first book, Above Suspicion (1941), a tale of espionage in Nazi Europe. It was an immediate success, widely praised for its suspense and humour, and it was made into a motion picture in 1943. Assignment in Brittany followed in 1942 and was also made into a movie…

Khachatur Abovean, the “father of modern Armenian literature,” wrote Wounds of Armenia in 1841. The most celebrated Armenian novelist was Hakob Meliq-Hakobian, or Raffi. Among eastern poets, Hovhannes Thumanian wrote lyric and narrative poems; and his masterpiece, a short epic, Anush, full of songs that…

…been designed for use in aboveground retorts as well as in situ. Three technologies that use this approach are the Kiviter process, employed in Estonia; the Fushun process of China; and the Paraho Direct process, designed in the United States.
Hot-recycled-solids methods circulate either burned shale or an inert material…

Abqaiq, town, eastern Saudi Arabia, about 25 miles (40 km) west of the Persian Gulf. It is situated in the southern end of the Abqaiq oil field, one of the largest and most productive in the kingdom. Abqaiq grew rapidly following the discovery of the field in 1940. By 1950 the town was the southern

Dunash Ben Labrat,, Hebrew poet, grammarian, and polemicist who was the first to use Arabic metres in his verse, thus inaugurating a new mode in Hebrew poetry. His strictures on the Hebrew lexicon of Menahem ben Saruq provoked a quarrel that helped initiate a golden age in Hebrew philology. Dunash

The same jagged crest on the Paleolithic chopper that developed into the ax also developed into another broad tool category, the knife, which combined a uniquely shaped sharp blade with a handle that optimized the position of the cutting edge. In contrast…

Abraha, Ethiopian Christian viceroy of Yemen in southern Arabia. Abraha was viceroy of the principality of Sabaʾ in Yemen for the (Christian) emperors of Ethiopia. A zealous Christian himself, he is said to have built a great church at Sanaa and to have repaired the principal irrigation dam at the

Abraham, the first of the Hebrew patriarchs and a figure revered by the three great monotheistic religions—Judaism, Christianity, and Islam. According to the biblical book of Genesis, Abraham left Ur, in Mesopotamia, because God called him to found a new nation in an undesignated land that he later

&gt;Abraham and Isaac, which had been commissioned from George Segal by the Mildred Andrews Foundation for donation to the university. The provocative bronze sculpture—depicting the biblical story of a father who is commanded by God to kill his son to prove his loyalty—was deemed “inappropriate”…

Abraham bar Hiyya, , Spanish Jewish philosopher, astronomer, astrologer, and mathematician whose writings were among the first scientific and philosophical works to be written in Hebrew. He is sometimes known as Savasorda, a corruption of an Arabic term indicating that he held some civic office in

…school experienced tremendous growth during Abraham de Bet Rabban’s tenure (until c. 569) as director. Its teachers wrote in the fields of literature, history, philology, and theology, as well as translating from Greek into Syriac. The school gained renown in the West and became a major centre of education for…

Ibrāhīm al-Ḥāqilānī, , Latinized form Abraham Ecchellensis Maronite Catholic scholar noted for his Arabic translation of books of the Bible. Ordained a deacon, Ibrāhīm taught Arabic and Syriac first at Pisa, then in Rome, and in 1628 he published a Syriac grammar. In 1640 he began collaborating on

… (1924), and his next-to-last film, Abraham Lincoln (1930), was another view of the American Civil War in a somewhat ponderous biographical style. Despite his past success and the general acknowledgement of his vital contributions to the syntax of the motion picture, Griffith was unable to find permanent employment after Abraham…

Abraham Lincoln Battalion,, a force of volunteers from the United States who served on the Republican side in the Spanish Civil War from January 1937 until November 1938. All seven International Brigades (q.v.)—each composed of three or more battalions—were formed by the Comintern (Communist

Fort Abraham Lincoln State Park, 7 miles (11 km) to the south, includes reconstructed buildings of Fort Lincoln, which was commanded by Lieutenant Colonel George Armstrong Custer before his “last stand” at the Battle of the Little Bighorn (June 25, 1876), and On-a-Slant Village, the…

Fort Abraham Lincoln State Park, 7 miles (11 km) to the south, includes reconstructed buildings of Fort Lincoln, which was commanded by Lieutenant Colonel George Armstrong Custer before his “last stand” at the Battle of the Little Bighorn (June 25, 1876), and On-a-Slant Village, the…

Abraham Lincoln: The War Years, four-volume biography by Carl Sandburg, published in 1939. It was awarded the 1940 Pulitzer Prize for history. After the success of Sandburg’s 1926 biography, Abraham Lincoln: The Prairie Years, Sandburg turned to Lincoln’s life after 1861, devoting 11 years to